case. // Don't do this for a block that split two inlines though. You do // still apply margins in this case. setTopMarginQuirk(true); } if (marginInfo.quirkContainer() && marginInfo.atTopOfBlock() && (posTop - negTop)) marginInfo.setTopQuirk(topQuirk); int ypos = height(); if (child->isSelfCollapsingBlock()) { // This child has no height. We need to compute our // position before we collapse the child's margins together, // so that we can get an accurate position for the zero-height block. int collapsedTopPos = max(marginInfo.posMargin(), child->maxTopMargin(true)); int collapsedTopNeg = max(marginInfo.negMargin(), child->maxTopMargin(false)); marginInfo.setMargin(collapsedTopPos, collapsedTopNeg); // Now collapse the child's margins together, which means examining our // bottom margin values as well. marginInfo.setPosMarginIfLarger(child->maxBottomMargin(true)); marginInfo.setNegMarginIfLarger(child->maxBottomMargin(false)); if (!marginInfo.canCollapseWithTop()) // We need to make sure that the position of the self-collapsing block // is correct, since it could have overflowing content // that needs to be positioned correctly (e.g., a block that // had a specified height of 0 but that actually had subcontent). ypos = height() + collapsedTopPos - collapsedTopNeg; } else { if (child->style()->marginTopCollapse() == MSEPARATE) { setHeight(height() + marginInfo.margin() + child->marginTop()); ypos = height(); } else if (!marginInfo.atTopOfBlock() || (!marginInfo.canCollapseTopWithChildren() && (!style()->htmlHacks() || !marginInfo.quirkContainer() || !marginInfo.topQuirk()))) { // We're collapsing with a previous sibling's margins and not // with the top of the block. setHeight(height() + max(marginInfo.posMargin(), posTop) - max(marginInfo.negMargin(), negTop)); ypos = height(); } marginInfo.setPosMargin(child->maxBottomMargin(true)); marginInfo.setNegMargin(child->maxBottomMargin(false)); if (marginInfo.margin()) marginInfo.setBottomQuirk(child->isBottomMarginQuirk() || style()->marginBottomCollapse() == MDISCARD); marginInfo.setSelfCollapsingBlockClearedFloat(false); } return ypos; } int RenderBlock::clearFloatsIfNeeded(RenderBox* child, MarginInfo& marginInfo, int oldTopPosMargin, int oldTopNegMargin, int yPos) { int heightIncrease = getClearDelta(child, yPos); if (!heightIncrease) return yPos; if (child->isSelfCollapsingBlock()) { // For self-collapsing blocks that clear, they can still collapse their // margins with following siblings. Reset the current margins to represent // the self-collapsing block's margins only. marginInfo.setPosMargin(max(child->maxTopMargin(true), child->maxBottomMargin(true))); marginInfo.setNegMargin(max(child->maxTopMargin(false), child->maxBottomMargin(false))); // Adjust our height such that we are ready to be collapsed with subsequent siblings. setHeight(child->y() - max(0, marginInfo.margin())); // Set a flag that we cleared a float so that we know both to increase the height of the block // to compensate for the clear and to avoid collapsing our margins with the parent block's // bottom margin. marginInfo.setSelfCollapsingBlockClearedFloat(true); } else // Increase our height by the amount we had to clear. setHeight(height() + heightIncrease); if (marginInfo.canCollapseWithTop()) { // We can no longer collapse with the top of the block since a clear // occurred. The empty blocks collapse into the cleared block. // FIXME: This isn't quite correct. Need clarification for what to do // if the height the cleared block is offset by is smaller than the // margins involved. setMaxTopMargins(oldTopPosMargin, oldTopNegMargin); marginInfo.setAtTopOfBlock(false); } return yPos + heightIncrease; } int RenderBlock::estimateVerticalPosition(RenderBox* child, const MarginInfo& marginInfo) { // FIXME: We need to eliminate the estimation of vertical position, because when it's wrong we sometimes trigger a pathological // relayout if there are intruding floats. int yPosEstimate = height(); if (!marginInfo.canCollapseWithTop()) { int childMarginTop = child->selfNeedsLayout() ? child->marginTop() : child->collapsedMarginTop(); yPosEstimate += max(marginInfo.margin(), childMarginTop); } yPosEstimate += getClearDelta(child, yPosEstimate); return yPosEstimate; } void RenderBlock::determineHorizontalPosition(RenderBox* child) { if (style()->direction() == LTR) { int xPos = borderLeft() + paddingLeft(); // Add in our left margin. int chPos = xPos + child->marginLeft(); // Some objects (e.g., tables, horizontal rules, overflow:auto blocks) avoid floats. They need // to shift over as necessary to dodge any floats that might get in the way. if (child->avoidsFloats()) { int leftOff = leftOffset(height(), false); if (style()->textAlign() != WEBKIT_CENTER && child->style()->marginLeft().type() != Auto) { if (child->marginLeft() < 0) leftOff += child->marginLeft(); chPos = max(chPos, leftOff); // Let the float sit in the child's margin if it can fit. } else if (leftOff != xPos) { // The object is shifting right. The object might be centered, so we need to // recalculate our horizontal margins. Note that the containing block content // width computation will take into account the delta between |leftOff| and |xPos| // so that we can just pass the content width in directly to the |calcHorizontalMargins| // function. child->calcHorizontalMargins(child->style()->marginLeft(), child->style()->marginRight(), lineWidth(child->y(), false)); chPos = leftOff + child->marginLeft(); } } view()->addLayoutDelta(IntSize(child->x() - chPos, 0)); child->setLocation(chPos, child->y()); } else { int xPos = width() - borderRight() - paddingRight() - verticalScrollbarWidth(); int chPos = xPos - (child->width() + child->marginRight()); if (child->avoidsFloats()) { int rightOff = rightOffset(height(), false); if (style()->textAlign() != WEBKIT_CENTER && child->style()->marginRight().type() != Auto) { if (child->marginRight() < 0) rightOff -= child->marginRight(); chPos = min(chPos, rightOff - child->width()); // Let the float sit in the child's margin if it can fit. } else if (rightOff != xPos) { // The object is shifting left. The object might be centered, so we need to // recalculate our horizontal margins. Note that the containing block content // width computation will take into account the delta between |rightOff| and |xPos| // so that we can just pass the content width in directly to the |calcHorizontalMargins| // function. child->calcHorizontalMargins(child->style()->marginLeft(), child->style()->marginRight(), lineWidth(child->y(), false)); chPos = rightOff - child->marginRight() - child->width(); } } view()->addLayoutDelta(IntSize(child->x() - chPos, 0)); child->setLocation(chPos, child->y()); } } void RenderBlock::setCollapsedBottomMargin(const MarginInfo& marginInfo) { if (marginInfo.canCollapseWithBottom() && !marginInfo.canCollapseWithTop()) { // Update our max pos/neg bottom margins, since we collapsed our bottom margins // with our children. setMaxBottomMargins(max(maxBottomPosMargin(), marginInfo.posMargin()), max(maxBottomNegMargin(), marginInfo.negMargin())); if (!marginInfo.bottomQuirk()) setBottomMarginQuirk(false); if (marginInfo.bottomQuirk() && marginBottom() == 0) // We have no bottom margin and our last child has a quirky margin. // We will pick up this quirky margin and pass it through. // This deals with the

case. setBottomMarginQuirk(true); } } void RenderBlock::handleBottomOfBlock(int top, int bottom, MarginInfo& marginInfo) { // If our last flow was a self-collapsing block that cleared a float, then we don't // collapse it with the bottom of the block. if (!marginInfo.selfCollapsingBlockClearedFloat()) marginInfo.setAtBottomOfBlock(true); else { // We have to special case the negative margin situation (where the collapsed // margin of the self-collapsing block is negative), since there's no need // to make an adjustment in that case. if (marginInfo.margin() < 0) marginInfo.clearMargin(); } // If we can't collapse with children then go ahead and add in the bottom margin. if (!marginInfo.canCollapseWithBottom() && !marginInfo.canCollapseWithTop() && (!style()->htmlHacks() || !marginInfo.quirkContainer() || !marginInfo.bottomQuirk())) setHeight(height() + marginInfo.margin()); // Now add in our bottom border/padding. setHeight(height() + bottom); // Negative margins can cause our height to shrink below our minimal height (border/padding). // If this happens, ensure that the computed height is increased to the minimal height. setHeight(max(height(), top + bottom)); // Always make sure our overflow height is at least our height. m_overflowHeight = max(height(), m_overflowHeight); // Update our bottom collapsed margin info. setCollapsedBottomMargin(marginInfo); } void RenderBlock::layoutBlockChildren(bool relayoutChildren, int& maxFloatBottom) { if (gPercentHeightDescendantsMap) { if (HashSet* descendants = gPercentHeightDescendantsMap->get(this)) { HashSet::iterator end = descendants->end(); for (HashSet::iterator it = descendants->begin(); it != end; ++it) { RenderBox* box = *it; while (box != this) { if (box->normalChildNeedsLayout()) break; box->setChildNeedsLayout(true, false); box = box->containingBlock(); ASSERT(box); if (!box) break; } } } } int top = borderTop() + paddingTop(); int bottom = borderBottom() + paddingBottom() + horizontalScrollbarHeight(); m_overflowHeight = top; setHeight(m_overflowHeight); // The margin struct caches all our current margin collapsing state. The compact struct caches state when we encounter compacts, MarginInfo marginInfo(this, top, bottom); // Fieldsets need to find their legend and position it inside the border of the object. // The legend then gets skipped during normal layout. RenderObject* legend = layoutLegend(relayoutChildren); int previousFloatBottom = 0; maxFloatBottom = 0; RenderBox* next = firstChildBox(); while (next) { RenderBox* child = next; next = child->nextSiblingBox(); if (legend == child) continue; // Skip the legend, since it has already been positioned up in the fieldset's border. int oldTopPosMargin = maxTopPosMargin(); int oldTopNegMargin = maxTopNegMargin(); // Make sure we layout children if they need it. // FIXME: Technically percentage height objects only need a relayout if their percentage isn't going to be turned into // an auto value. Add a method to determine this, so that we can avoid the relayout. if (relayoutChildren || ((child->style()->height().isPercent() || child->style()->minHeight().isPercent() || child->style()->maxHeight().isPercent()) && !isRenderView())) child->setChildNeedsLayout(true, false); // If relayoutChildren is set and we have percentage padding, we also need to invalidate the child's pref widths. if (relayoutChildren && (child->style()->paddingLeft().isPercent() || child->style()->paddingRight().isPercent())) child->setPrefWidthsDirty(true, false); // Handle the four types of special elements first. These include positioned content, floating content, compacts and // run-ins. When we encounter these four types of objects, we don't actually lay them out as normal flow blocks. if (handleSpecialChild(child, marginInfo)) continue; // The child is a normal flow object. Compute its vertical margins now. child->calcVerticalMargins(); // Do not allow a collapse if the margin top collapse style is set to SEPARATE. if (child->style()->marginTopCollapse() == MSEPARATE) { marginInfo.setAtTopOfBlock(false); marginInfo.clearMargin(); } // Try to guess our correct y position. In most cases this guess will // be correct. Only if we're wrong (when we compute the real y position) // will we have to potentially relayout. int yPosEstimate = estimateVerticalPosition(child, marginInfo); // Cache our old rect so that we can dirty the proper repaint rects if the child moves. IntRect oldRect(child->x(), child->y() , child->width(), child->height()); #ifndef NDEBUG IntSize oldLayoutDelta = view()->layoutDelta(); #endif // Go ahead and position the child as though it didn't collapse with the top. view()->addLayoutDelta(IntSize(0, child->y() - yPosEstimate)); child->setLocation(child->x(), yPosEstimate); bool markDescendantsWithFloats = false; if (yPosEstimate != oldRect.y() && !child->avoidsFloats() && child->isBlockFlow() && toRenderBlock(child)->containsFloats()) markDescendantsWithFloats = true; else if (!child->avoidsFloats() || child->shrinkToAvoidFloats()) { // If an element might be affected by the presence of floats, then always mark it for // layout. int fb = max(previousFloatBottom, floatBottom()); if (fb > yPosEstimate) markDescendantsWithFloats = true; } if (child->isRenderBlock()) { if (markDescendantsWithFloats) toRenderBlock(child)->markAllDescendantsWithFloatsForLayout(); previousFloatBottom = max(previousFloatBottom, oldRect.y() + toRenderBlock(child)->floatBottom()); } bool childHadLayout = child->m_everHadLayout; bool childNeededLayout = child->needsLayout(); if (childNeededLayout) child->layout(); // Now determine the correct ypos based off examination of collapsing margin // values. int yBeforeClear = collapseMargins(child, marginInfo); // Now check for clear. int yAfterClear = clearFloatsIfNeeded(child, marginInfo, oldTopPosMargin, oldTopNegMargin, yBeforeClear); view()->addLayoutDelta(IntSize(0, yPosEstimate - yAfterClear)); child->setLocation(child->x(), yAfterClear); // Now we have a final y position. See if it really does end up being different from our estimate. if (yAfterClear != yPosEstimate) { if (child->shrinkToAvoidFloats()) { // The child's width depends on the line width. // When the child shifts to clear an item, its width can // change (because it has more available line width). // So go ahead and mark the item as dirty. child->setChildNeedsLayout(true, false); } if (!child->avoidsFloats() && child->isBlockFlow() && toRenderBlock(child)->containsFloats()) toRenderBlock(child)->markAllDescendantsWithFloatsForLayout(); // Our guess was wrong. Make the child lay itself out again. child->layoutIfNeeded(); } // We are no longer at the top of the block if we encounter a non-empty child. // This has to be done after checking for clear, so that margins can be reset if a clear occurred. if (marginInfo.atTopOfBlock() && !child->isSelfCollapsingBlock()) marginInfo.setAtTopOfBlock(false); // Now place the child in the correct horizontal position determineHorizontalPosition(child); // Update our height now that the child has been placed in the correct position. setHeight(height() + child->height()); if (child->style()->marginBottomCollapse() == MSEPARATE) { setHeight(height() + child->marginBottom()); marginInfo.clearMargin(); } // If the child has overhanging floats that intrude into following siblings (or possibly out // of this block), then the parent gets notified of the floats now. if (child->isBlockFlow() && toRenderBlock(child)->containsFloats()) maxFloatBottom = max(maxFloatBottom, addOverhangingFloats(toRenderBlock(child), -child->x(), -child->y(), !childNeededLayout)); // Update our visual overflow in case the child spills out the block, but only if we were going to paint // the child block ourselves. if (!child->hasSelfPaintingLayer()) { m_overflowTop = min(m_overflowTop, child->y() + child->overflowTop(false)); m_overflowHeight = max(m_overflowHeight, height() + child->overflowHeight(false) - child->height()); m_overflowWidth = max(child->x() + child->overflowWidth(false), m_overflowWidth); m_overflowLeft = min(child->x() + child->overflowLeft(false), m_overflowLeft); } IntSize childOffset(child->x() - oldRect.x(), child->y() - oldRect.y()); if (childOffset.width() || childOffset.height()) { view()->addLayoutDelta(childOffset); // If the child moved, we have to repaint it as well as any floating/positioned // descendants. An exception is if we need a layout. In this case, we know we're going to // repaint ourselves (and the child) anyway. if (childHadLayout && !selfNeedsLayout() && child->checkForRepaintDuringLayout()) child->repaintDuringLayoutIfMoved(oldRect); } if (!childHadLayout && child->checkForRepaintDuringLayout()) { child->repaint(); child->repaintOverhangingFloats(true); } ASSERT(oldLayoutDelta == view()->layoutDelta()); } // Now do the handling of the bottom of the block, adding in our bottom border/padding and // determining the correct collapsed bottom margin information. handleBottomOfBlock(top, bottom, marginInfo); } bool RenderBlock::layoutOnlyPositionedObjects() { if (!posChildNeedsLayout() || normalChildNeedsLayout() || selfNeedsLayout()) return false; LayoutStateMaintainer statePusher(view(), this, IntSize(x(), y()), hasColumns() || hasTransform() || hasReflection()); if (needsPositionedMovementLayout()) { tryLayoutDoingPositionedMovementOnly(); if (needsLayout()) return false; } // All we have to is lay out our positioned objects. layoutPositionedObjects(false); statePusher.pop(); updateScrollInfoAfterLayout(); setNeedsLayout(false); return true; } void RenderBlock::layoutPositionedObjects(bool relayoutChildren) { if (m_positionedObjects) { RenderBox* r; Iterator end = m_positionedObjects->end(); for (Iterator it = m_positionedObjects->begin(); it != end; ++it) { r = *it; // When a non-positioned block element moves, it may have positioned children that are implicitly positioned relative to the // non-positioned block. Rather than trying to detect all of these movement cases, we just always lay out positioned // objects that are positioned implicitly like this. Such objects are rare, and so in typical DHTML menu usage (where everything is // positioned explicitly) this should not incur a performance penalty. if (relayoutChildren || (r->style()->hasStaticY() && r->parent() != this && r->parent()->isBlockFlow())) r->setChildNeedsLayout(true, false); // If relayoutChildren is set and we have percentage padding, we also need to invalidate the child's pref widths. //if (relayoutChildren && (r->style()->paddingLeft().isPercent() || r->style()->paddingRight().isPercent())) r->setPrefWidthsDirty(true, false); // We don't have to do a full layout. We just have to update our position. Try that first. If we have shrink-to-fit width // and we hit the available width constraint, the layoutIfNeeded() will catch it and do a full layout. if (r->needsPositionedMovementLayoutOnly()) r->tryLayoutDoingPositionedMovementOnly(); r->layoutIfNeeded(); } } } void RenderBlock::markPositionedObjectsForLayout() { if (m_positionedObjects) { RenderBox* r; Iterator end = m_positionedObjects->end(); for (Iterator it = m_positionedObjects->begin(); it != end; ++it) { r = *it; r->setChildNeedsLayout(true); } } } void RenderBlock::repaintOverhangingFloats(bool paintAllDescendants) { // Repaint any overhanging floats (if we know we're the one to paint them). if (hasOverhangingFloats()) { // We think that we must be in a bad state if m_floatingObjects is nil at this point, so // we assert on Debug builds and nil-check Release builds. ASSERT(m_floatingObjects); if (!m_floatingObjects) return; FloatingObject* r; DeprecatedPtrListIterator it(*m_floatingObjects); // FIXME: Avoid disabling LayoutState. At the very least, don't disable it for floats originating // in this block. Better yet would be to push extra state for the containers of other floats. view()->disableLayoutState(); for ( ; (r = it.current()); ++it) { // Only repaint the object if it is overhanging, is not in its own layer, and // is our responsibility to paint (m_shouldPaint is set). When paintAllDescendants is true, the latter // condition is replaced with being a descendant of us. if (r->m_bottom > height() && ((paintAllDescendants && r->m_renderer->isDescendantOf(this)) || r->m_shouldPaint) && !r->m_renderer->hasSelfPaintingLayer()) { r->m_renderer->repaint(); r->m_renderer->repaintOverhangingFloats(); } } view()->enableLayoutState(); } } void RenderBlock::paint(PaintInfo& paintInfo, int tx, int ty) { tx += x(); ty += y(); PaintPhase phase = paintInfo.phase; // Check if we need to do anything at all. // FIXME: Could eliminate the isRoot() check if we fix background painting so that the RenderView // paints the root's background. if (!isRoot()) { IntRect overflowBox = overflowRect(false); overflowBox.inflate(maximalOutlineSize(paintInfo.phase)); overflowBox.move(tx, ty); if (!overflowBox.intersects(paintInfo.rect)) return; } bool pushedClip = pushContentsClip(paintInfo, tx, ty); paintObject(paintInfo, tx, ty); if (pushedClip) popContentsClip(paintInfo, phase, tx, ty); // Our scrollbar widgets paint exactly when we tell them to, so that they work properly with // z-index. We paint after we painted the background/border, so that the scrollbars will // sit above the background/border. if (hasOverflowClip() && style()->visibility() == VISIBLE && (phase == PaintPhaseBlockBackground || phase == PaintPhaseChildBlockBackground)) layer()->paintOverflowControls(paintInfo.context, tx, ty, paintInfo.rect); } void RenderBlock::paintColumnRules(PaintInfo& paintInfo, int tx, int ty) { const Color& ruleColor = style()->columnRuleColor(); bool ruleTransparent = style()->columnRuleIsTransparent(); EBorderStyle ruleStyle = style()->columnRuleStyle(); int ruleWidth = style()->columnRuleWidth(); int colGap = columnGap(); bool renderRule = ruleStyle > BHIDDEN && !ruleTransparent && ruleWidth <= colGap; if (!renderRule) return; // We need to do multiple passes, breaking up our child painting into strips. int currXOffset = 0; int ruleAdd = borderLeft() + paddingLeft(); int ruleX = 0; Vector* colRects = columnRects(); unsigned colCount = colRects->size(); for (unsigned i = 0; i < colCount; i++) { // For each rect, we clip to the rect, and then we adjust our coords. IntRect colRect = colRects->at(i); // Move to the next position. if (style()->direction() == LTR) { ruleX += colRect.width() + colGap / 2; currXOffset += colRect.width() + colGap; } else { ruleX -= (colRect.width() + colGap / 2); currXOffset -= (colRect.width() + colGap); } // Now paint the column rule. if (i < colCount - 1) { int ruleStart = tx + ruleX - ruleWidth / 2 + ruleAdd; int ruleEnd = ruleStart + ruleWidth; int ruleTop = ty + borderTop() + paddingTop(); int ruleBottom = ruleTop + contentHeight(); drawLineForBoxSide(paintInfo.context, ruleStart, ruleTop, ruleEnd, ruleBottom, style()->direction() == LTR ? BSLeft : BSRight, ruleColor, style()->color(), ruleStyle, 0, 0); } ruleX = currXOffset; } } void RenderBlock::paintColumnContents(PaintInfo& paintInfo, int tx, int ty, bool paintingFloats) { // We need to do multiple passes, breaking up our child painting into strips. GraphicsContext* context = paintInfo.context; int currXOffset = 0; int currYOffset = 0; int colGap = columnGap(); Vector* colRects = columnRects(); unsigned colCount = colRects->size(); for (unsigned i = 0; i < colCount; i++) { // For each rect, we clip to the rect, and then we adjust our coords. IntRect colRect = colRects->at(i); colRect.move(tx, ty); context->save(); // Each strip pushes a clip, since column boxes are specified as being // like overflow:hidden. context->clip(colRect); // Adjust tx and ty to change where we paint. PaintInfo info(paintInfo); info.rect.intersect(colRect); // Adjust our x and y when painting. int finalX = tx + currXOffset; int finalY = ty + currYOffset; if (paintingFloats) paintFloats(info, finalX, finalY, paintInfo.phase == PaintPhaseSelection || paintInfo.phase == PaintPhaseTextClip); else paintContents(info, finalX, finalY); // Move to the next position. if (style()->direction() == LTR) currXOffset += colRect.width() + colGap; else currXOffset -= (colRect.width() + colGap); currYOffset -= colRect.height(); context->restore(); } } void RenderBlock::paintContents(PaintInfo& paintInfo, int tx, int ty) { // Avoid painting descendants of the root element when stylesheets haven't loaded. This eliminates FOUC. // It's ok not to draw, because later on, when all the stylesheets do load, updateStyleSelector on the Document // will do a full repaint(). if (document()->didLayoutWithPendingStylesheets() && !isRenderView()) return; if (childrenInline()) m_lineBoxes.paint(this, paintInfo, tx, ty); else paintChildren(paintInfo, tx, ty); } void RenderBlock::paintChildren(PaintInfo& paintInfo, int tx, int ty) { PaintPhase newPhase = (paintInfo.phase == PaintPhaseChildOutlines) ? PaintPhaseOutline : paintInfo.phase; newPhase = (newPhase == PaintPhaseChildBlockBackgrounds) ? PaintPhaseChildBlockBackground : newPhase; // We don't paint our own background, but we do let the kids paint their backgrounds. PaintInfo info(paintInfo); info.phase = newPhase; info.paintingRoot = paintingRootForChildren(paintInfo); bool isPrinting = document()->printing(); for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) { // Check for page-break-before: always, and if it's set, break and bail. if (isPrinting && !childrenInline() && child->style()->pageBreakBefore() == PBALWAYS && inRootBlockContext() && (ty + child->y()) > paintInfo.rect.y() && (ty + child->y()) < paintInfo.rect.bottom()) { view()->setBestTruncatedAt(ty + child->y(), this, true); return; } if (!child->hasSelfPaintingLayer() && !child->isFloating()) child->paint(info, tx, ty); // Check for page-break-after: always, and if it's set, break and bail. if (isPrinting && !childrenInline() && child->style()->pageBreakAfter() == PBALWAYS && inRootBlockContext() && (ty + child->y() + child->height()) > paintInfo.rect.y() && (ty + child->y() + child->height()) < paintInfo.rect.bottom()) { view()->setBestTruncatedAt(ty + child->y() + child->height() + max(0, child->collapsedMarginBottom()), this, true); return; } } } void RenderBlock::paintCaret(PaintInfo& paintInfo, int tx, int ty, CaretType type) { SelectionController* selection = type == CursorCaret ? document()->frame()->selection() : document()->frame()->dragCaretController(); // Paint the caret if the SelectionController says so or if caret browsing is enabled bool caretBrowsing = document()->frame()->settings() && document()->frame()->settings()->caretBrowsingEnabled(); RenderObject* caretPainter = selection->caretRenderer(); if (caretPainter == this && (selection->isContentEditable() || caretBrowsing)) { // Convert the painting offset into the local coordinate system of this renderer, // to match the localCaretRect computed by the SelectionController offsetForContents(tx, ty); if (type == CursorCaret) document()->frame()->paintCaret(paintInfo.context, tx, ty, paintInfo.rect); else document()->frame()->paintDragCaret(paintInfo.context, tx, ty, paintInfo.rect); } } void RenderBlock::paintObject(PaintInfo& paintInfo, int tx, int ty) { PaintPhase paintPhase = paintInfo.phase; // 1. paint background, borders etc if ((paintPhase == PaintPhaseBlockBackground || paintPhase == PaintPhaseChildBlockBackground) && style()->visibility() == VISIBLE) { if (hasBoxDecorations()) paintBoxDecorations(paintInfo, tx, ty); if (hasColumns()) paintColumnRules(paintInfo, tx, ty); } if (paintPhase == PaintPhaseMask && style()->visibility() == VISIBLE) { paintMask(paintInfo, tx, ty); return; } // We're done. We don't bother painting any children. if (paintPhase == PaintPhaseBlockBackground) return; // Adjust our painting position if we're inside a scrolled layer (e.g., an overflow:auto div).s int scrolledX = tx; int scrolledY = ty; if (hasOverflowClip()) layer()->subtractScrolledContentOffset(scrolledX, scrolledY); // 2. paint contents if (paintPhase != PaintPhaseSelfOutline) { if (hasColumns()) paintColumnContents(paintInfo, scrolledX, scrolledY); else paintContents(paintInfo, scrolledX, scrolledY); } // 3. paint selection // FIXME: Make this work with multi column layouts. For now don't fill gaps. bool isPrinting = document()->printing(); if (!isPrinting && !hasColumns()) paintSelection(paintInfo, scrolledX, scrolledY); // Fill in gaps in selection on lines and between blocks. // 4. paint floats. if (paintPhase == PaintPhaseFloat || paintPhase == PaintPhaseSelection || paintPhase == PaintPhaseTextClip) { if (hasColumns()) paintColumnContents(paintInfo, scrolledX, scrolledY, true); else paintFloats(paintInfo, scrolledX, scrolledY, paintPhase == PaintPhaseSelection || paintPhase == PaintPhaseTextClip); } // 5. paint outline. if ((paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseSelfOutline) && hasOutline() && style()->visibility() == VISIBLE) paintOutline(paintInfo.context, tx, ty, width(), height(), style()); // 6. paint continuation outlines. if ((paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseChildOutlines)) { if (inlineContinuation() && inlineContinuation()->hasOutline() && inlineContinuation()->style()->visibility() == VISIBLE) { RenderInline* inlineRenderer = toRenderInline(inlineContinuation()->node()->renderer()); if (!inlineRenderer->hasSelfPaintingLayer()) containingBlock()->addContinuationWithOutline(inlineRenderer); else if (!inlineRenderer->firstLineBox()) inlineRenderer->paintOutline(paintInfo.context, tx - x() + inlineRenderer->containingBlock()->x(), ty - y() + inlineRenderer->containingBlock()->y()); } paintContinuationOutlines(paintInfo, tx, ty); } // 7. paint caret. // If the caret's node's render object's containing block is this block, and the paint action is PaintPhaseForeground, // then paint the caret. if (paintPhase == PaintPhaseForeground) { paintCaret(paintInfo, scrolledX, scrolledY, CursorCaret); paintCaret(paintInfo, scrolledX, scrolledY, DragCaret); } } void RenderBlock::paintFloats(PaintInfo& paintInfo, int tx, int ty, bool preservePhase) { if (!m_floatingObjects) return; FloatingObject* r; DeprecatedPtrListIterator it(*m_floatingObjects); for (; (r = it.current()); ++it) { // Only paint the object if our m_shouldPaint flag is set. if (r->m_shouldPaint && !r->m_renderer->hasSelfPaintingLayer()) { PaintInfo currentPaintInfo(paintInfo); currentPaintInfo.phase = preservePhase ? paintInfo.phase : PaintPhaseBlockBackground; int currentTX = tx + r->m_left - r->m_renderer->x() + r->m_renderer->marginLeft(); int currentTY = ty + r->m_top - r->m_renderer->y() + r->m_renderer->marginTop(); r->m_renderer->paint(currentPaintInfo, currentTX, currentTY); if (!preservePhase) { currentPaintInfo.phase = PaintPhaseChildBlockBackgrounds; r->m_renderer->paint(currentPaintInfo, currentTX, currentTY); currentPaintInfo.phase = PaintPhaseFloat; r->m_renderer->paint(currentPaintInfo, currentTX, currentTY); currentPaintInfo.phase = PaintPhaseForeground; r->m_renderer->paint(currentPaintInfo, currentTX, currentTY); currentPaintInfo.phase = PaintPhaseOutline; r->m_renderer->paint(currentPaintInfo, currentTX, currentTY); } } } } void RenderBlock::paintEllipsisBoxes(PaintInfo& paintInfo, int tx, int ty) { if (!shouldPaintWithinRoot(paintInfo) || !firstLineBox()) return; if (style()->visibility() == VISIBLE && paintInfo.phase == PaintPhaseForeground) { // We can check the first box and last box and avoid painting if we don't // intersect. int yPos = ty + firstLineBox()->y(); int h = lastLineBox()->y() + lastLineBox()->height() - firstLineBox()->y(); if (yPos >= paintInfo.rect.bottom() || yPos + h <= paintInfo.rect.y()) return; // See if our boxes intersect with the dirty rect. If so, then we paint // them. Note that boxes can easily overlap, so we can't make any assumptions // based off positions of our first line box or our last line box. for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) { yPos = ty + curr->y(); h = curr->height(); if (curr->ellipsisBox() && yPos < paintInfo.rect.bottom() && yPos + h > paintInfo.rect.y()) curr->paintEllipsisBox(paintInfo, tx, ty); } } } static ContinuationOutlineTableMap* continuationOutlineTable() { DEFINE_STATIC_LOCAL(ContinuationOutlineTableMap, table, ()); return &table; } void RenderBlock::addContinuationWithOutline(RenderInline* flow) { // We can't make this work if the inline is in a layer. We'll just rely on the broken // way of painting. ASSERT(!flow->layer() && !flow->isInlineContinuation()); ContinuationOutlineTableMap* table = continuationOutlineTable(); ListHashSet* continuations = table->get(this); if (!continuations) { continuations = new ListHashSet; table->set(this, continuations); } continuations->add(flow); } void RenderBlock::paintContinuationOutlines(PaintInfo& info, int tx, int ty) { ContinuationOutlineTableMap* table = continuationOutlineTable(); if (table->isEmpty()) return; ListHashSet* continuations = table->get(this); if (!continuations) return; // Paint each continuation outline. ListHashSet::iterator end = continuations->end(); for (ListHashSet::iterator it = continuations->begin(); it != end; ++it) { // Need to add in the coordinates of the intervening blocks. RenderInline* flow = *it; RenderBlock* block = flow->containingBlock(); for ( ; block && block != this; block = block->containingBlock()) { tx += block->x(); ty += block->y(); } ASSERT(block); flow->paintOutline(info.context, tx, ty); } // Delete delete continuations; table->remove(this); } void RenderBlock::setSelectionState(SelectionState s) { if (selectionState() == s) return; if (s == SelectionInside && selectionState() != SelectionNone) return; if ((s == SelectionStart && selectionState() == SelectionEnd) || (s == SelectionEnd && selectionState() == SelectionStart)) RenderBox::setSelectionState(SelectionBoth); else RenderBox::setSelectionState(s); RenderBlock* cb = containingBlock(); if (cb && !cb->isRenderView()) cb->setSelectionState(s); } bool RenderBlock::shouldPaintSelectionGaps() const { return selectionState() != SelectionNone && style()->visibility() == VISIBLE && isSelectionRoot(); } bool RenderBlock::isSelectionRoot() const { if (!node()) return false; // FIXME: Eventually tables should have to learn how to fill gaps between cells, at least in simple non-spanning cases. if (isTable()) return false; if (isBody() || isRoot() || hasOverflowClip() || isRelPositioned() || isFloatingOrPositioned() || isTableCell() || isInlineBlockOrInlineTable() || hasTransform() || hasReflection() || hasMask()) return true; if (view() && view()->selectionStart()) { Node* startElement = view()->selectionStart()->node(); if (startElement && startElement->rootEditableElement() == node()) return true; } return false; } GapRects RenderBlock::selectionGapRectsForRepaint(RenderBoxModelObject* /*repaintContainer*/) { ASSERT(!needsLayout()); if (!shouldPaintSelectionGaps()) return GapRects(); // FIXME: this is broken with transforms and a non-null repaintContainer FloatPoint absContentPoint = localToAbsolute(FloatPoint()); if (hasOverflowClip()) absContentPoint -= layer()->scrolledContentOffset(); int lastTop = 0; int lastLeft = leftSelectionOffset(this, lastTop); int lastRight = rightSelectionOffset(this, lastTop); return fillSelectionGaps(this, absContentPoint.x(), absContentPoint.y(), absContentPoint.x(), absContentPoint.y(), lastTop, lastLeft, lastRight); } void RenderBlock::paintSelection(PaintInfo& paintInfo, int tx, int ty) { if (shouldPaintSelectionGaps() && paintInfo.phase == PaintPhaseForeground) { int lastTop = 0; int lastLeft = leftSelectionOffset(this, lastTop); int lastRight = rightSelectionOffset(this, lastTop); paintInfo.context->save(); fillSelectionGaps(this, tx, ty, tx, ty, lastTop, lastLeft, lastRight, &paintInfo); paintInfo.context->restore(); } } #ifndef BUILDING_ON_TIGER static void clipOutPositionedObjects(const RenderObject::PaintInfo* paintInfo, int tx, int ty, ListHashSet* positionedObjects) { if (!positionedObjects) return; ListHashSet::const_iterator end = positionedObjects->end(); for (ListHashSet::const_iterator it = positionedObjects->begin(); it != end; ++it) { RenderBox* r = *it; paintInfo->context->clipOut(IntRect(tx + r->x(), ty + r->y(), r->width(), r->height())); } } #endif GapRects RenderBlock::fillSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo) { #ifndef BUILDING_ON_TIGER // IMPORTANT: Callers of this method that intend for painting to happen need to do a save/restore. // Clip out floating and positioned objects when painting selection gaps. if (paintInfo) { // Note that we don't clip out overflow for positioned objects. We just stick to the border box. clipOutPositionedObjects(paintInfo, tx, ty, m_positionedObjects); if (isBody() || isRoot()) // The must make sure to examine its containingBlock's positioned objects. for (RenderBlock* cb = containingBlock(); cb && !cb->isRenderView(); cb = cb->containingBlock()) clipOutPositionedObjects(paintInfo, cb->x(), cb->y(), cb->m_positionedObjects); if (m_floatingObjects) { for (DeprecatedPtrListIterator it(*m_floatingObjects); it.current(); ++it) { FloatingObject* r = it.current(); paintInfo->context->clipOut(IntRect(tx + r->m_left + r->m_renderer->marginLeft(), ty + r->m_top + r->m_renderer->marginTop(), r->m_renderer->width(), r->m_renderer->height())); } } } #endif // FIXME: overflow: auto/scroll regions need more math here, since painting in the border box is different from painting in the padding box (one is scrolled, the other is // fixed). GapRects result; if (!isBlockFlow()) // FIXME: Make multi-column selection gap filling work someday. return result; if (hasColumns() || hasTransform()) { // FIXME: We should learn how to gap fill multiple columns and transforms eventually. lastTop = (ty - blockY) + height(); lastLeft = leftSelectionOffset(rootBlock, height()); lastRight = rightSelectionOffset(rootBlock, height()); return result; } if (childrenInline()) result = fillInlineSelectionGaps(rootBlock, blockX, blockY, tx, ty, lastTop, lastLeft, lastRight, paintInfo); else result = fillBlockSelectionGaps(rootBlock, blockX, blockY, tx, ty, lastTop, lastLeft, lastRight, paintInfo); // Go ahead and fill the vertical gap all the way to the bottom of our block if the selection extends past our block. if (rootBlock == this && (selectionState() != SelectionBoth && selectionState() != SelectionEnd)) result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight, ty + height(), rootBlock, blockX, blockY, paintInfo)); return result; } GapRects RenderBlock::fillInlineSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo) { GapRects result; bool containsStart = selectionState() == SelectionStart || selectionState() == SelectionBoth; if (!firstLineBox()) { if (containsStart) { // Go ahead and update our lastY to be the bottom of the block.

s or empty blocks with height can trip this // case. lastTop = (ty - blockY) + height(); lastLeft = leftSelectionOffset(rootBlock, height()); lastRight = rightSelectionOffset(rootBlock, height()); } return result; } RootInlineBox* lastSelectedLine = 0; RootInlineBox* curr; for (curr = firstRootBox(); curr && !curr->hasSelectedChildren(); curr = curr->nextRootBox()) { } // Now paint the gaps for the lines. for (; curr && curr->hasSelectedChildren(); curr = curr->nextRootBox()) { int selTop = curr->selectionTop(); int selHeight = curr->selectionHeight(); if (!containsStart && !lastSelectedLine && selectionState() != SelectionStart && selectionState() != SelectionBoth) result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight, ty + selTop, rootBlock, blockX, blockY, paintInfo)); if (!paintInfo || (ty + selTop < paintInfo->rect.bottom() && ty + selTop + selHeight > paintInfo->rect.y())) result.unite(curr->fillLineSelectionGap(selTop, selHeight, rootBlock, blockX, blockY, tx, ty, paintInfo)); lastSelectedLine = curr; } if (containsStart && !lastSelectedLine) // VisibleSelection must start just after our last line. lastSelectedLine = lastRootBox(); if (lastSelectedLine && selectionState() != SelectionEnd && selectionState() != SelectionBoth) { // Go ahead and update our lastY to be the bottom of the last selected line. lastTop = (ty - blockY) + lastSelectedLine->bottomOverflow(); lastLeft = leftSelectionOffset(rootBlock, lastSelectedLine->bottomOverflow()); lastRight = rightSelectionOffset(rootBlock, lastSelectedLine->bottomOverflow()); } return result; } GapRects RenderBlock::fillBlockSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo) { GapRects result; // Go ahead and jump right to the first block child that contains some selected objects. RenderBox* curr; for (curr = firstChildBox(); curr && curr->selectionState() == SelectionNone; curr = curr->nextSiblingBox()) { } for (bool sawSelectionEnd = false; curr && !sawSelectionEnd; curr = curr->nextSiblingBox()) { SelectionState childState = curr->selectionState(); if (childState == SelectionBoth || childState == SelectionEnd) sawSelectionEnd = true; if (curr->isFloatingOrPositioned()) continue; // We must be a normal flow object in order to even be considered. if (curr->isRelPositioned() && curr->hasLayer()) { // If the relposition offset is anything other than 0, then treat this just like an absolute positioned element. // Just disregard it completely. IntSize relOffset = curr->layer()->relativePositionOffset(); if (relOffset.width() || relOffset.height()) continue; } bool paintsOwnSelection = curr->shouldPaintSelectionGaps() || curr->isTable(); // FIXME: Eventually we won't special-case table like this. bool fillBlockGaps = paintsOwnSelection || (curr->canBeSelectionLeaf() && childState != SelectionNone); if (fillBlockGaps) { // We need to fill the vertical gap above this object. if (childState == SelectionEnd || childState == SelectionInside) // Fill the gap above the object. result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight, ty + curr->y(), rootBlock, blockX, blockY, paintInfo)); // Only fill side gaps for objects that paint their own selection if we know for sure the selection is going to extend all the way *past* // our object. We know this if the selection did not end inside our object. if (paintsOwnSelection && (childState == SelectionStart || sawSelectionEnd)) childState = SelectionNone; // Fill side gaps on this object based off its state. bool leftGap, rightGap; getHorizontalSelectionGapInfo(childState, leftGap, rightGap); if (leftGap) result.uniteLeft(fillLeftSelectionGap(this, curr->x(), curr->y(), curr->height(), rootBlock, blockX, blockY, tx, ty, paintInfo)); if (rightGap) result.uniteRight(fillRightSelectionGap(this, curr->x() + curr->width(), curr->y(), curr->height(), rootBlock, blockX, blockY, tx, ty, paintInfo)); // Update lastTop to be just underneath the object. lastLeft and lastRight extend as far as // they can without bumping into floating or positioned objects. Ideally they will go right up // to the border of the root selection block. lastTop = (ty - blockY) + (curr->y() + curr->height()); lastLeft = leftSelectionOffset(rootBlock, curr->y() + curr->height()); lastRight = rightSelectionOffset(rootBlock, curr->y() + curr->height()); } else if (childState != SelectionNone) // We must be a block that has some selected object inside it. Go ahead and recur. result.unite(toRenderBlock(curr)->fillSelectionGaps(rootBlock, blockX, blockY, tx + curr->x(), ty + curr->y(), lastTop, lastLeft, lastRight, paintInfo)); } return result; } IntRect RenderBlock::fillHorizontalSelectionGap(RenderObject* selObj, int xPos, int yPos, int width, int height, const PaintInfo* paintInfo) { if (width <= 0 || height <= 0) return IntRect(); IntRect gapRect(xPos, yPos, width, height); if (paintInfo && selObj->style()->visibility() == VISIBLE) paintInfo->context->fillRect(gapRect, selObj->selectionBackgroundColor()); return gapRect; } IntRect RenderBlock::fillVerticalSelectionGap(int lastTop, int lastLeft, int lastRight, int bottomY, RenderBlock* rootBlock, int blockX, int blockY, const PaintInfo* paintInfo) { int top = blockY + lastTop; int height = bottomY - top; if (height <= 0) return IntRect(); // Get the selection offsets for the bottom of the gap int left = blockX + max(lastLeft, leftSelectionOffset(rootBlock, bottomY)); int right = blockX + min(lastRight, rightSelectionOffset(rootBlock, bottomY)); int width = right - left; if (width <= 0) return IntRect(); IntRect gapRect(left, top, width, height); if (paintInfo) paintInfo->context->fillRect(gapRect, selectionBackgroundColor()); return gapRect; } IntRect RenderBlock::fillLeftSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock, int blockX, int /*blockY*/, int tx, int ty, const PaintInfo* paintInfo) { int top = yPos + ty; int left = blockX + max(leftSelectionOffset(rootBlock, yPos), leftSelectionOffset(rootBlock, yPos + height)); int right = min(xPos + tx, blockX + min(rightSelectionOffset(rootBlock, yPos), rightSelectionOffset(rootBlock, yPos + height))); int width = right - left; if (width <= 0) return IntRect(); IntRect gapRect(left, top, width, height); if (paintInfo) paintInfo->context->fillRect(gapRect, selObj->selectionBackgroundColor()); return gapRect; } IntRect RenderBlock::fillRightSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock, int blockX, int /*blockY*/, int tx, int ty, const PaintInfo* paintInfo) { int left = max(xPos + tx, blockX + max(leftSelectionOffset(rootBlock, yPos), leftSelectionOffset(rootBlock, yPos + height))); int top = yPos + ty; int right = blockX + min(rightSelectionOffset(rootBlock, yPos), rightSelectionOffset(rootBlock, yPos + height)); int width = right - left; if (width <= 0) return IntRect(); IntRect gapRect(left, top, width, height); if (paintInfo) paintInfo->context->fillRect(gapRect, selObj->selectionBackgroundColor()); return gapRect; } void RenderBlock::getHorizontalSelectionGapInfo(SelectionState state, bool& leftGap, bool& rightGap) { bool ltr = style()->direction() == LTR; leftGap = (state == RenderObject::SelectionInside) || (state == RenderObject::SelectionEnd && ltr) || (state == RenderObject::SelectionStart && !ltr); rightGap = (state == RenderObject::SelectionInside) || (state == RenderObject::SelectionStart && ltr) || (state == RenderObject::SelectionEnd && !ltr); } int RenderBlock::leftSelectionOffset(RenderBlock* rootBlock, int yPos) { int left = leftOffset(yPos, false); if (left == borderLeft() + paddingLeft()) { if (rootBlock != this) // The border can potentially be further extended by our containingBlock(). return containingBlock()->leftSelectionOffset(rootBlock, yPos + y()); return left; } else { RenderBlock* cb = this; while (cb != rootBlock) { left += cb->x(); cb = cb->containingBlock(); } } return left; } int RenderBlock::rightSelectionOffset(RenderBlock* rootBlock, int yPos) { int right = rightOffset(yPos, false); if (right == (contentWidth() + (borderLeft() + paddingLeft()))) { if (rootBlock != this) // The border can potentially be further extended by our containingBlock(). return containingBlock()->rightSelectionOffset(rootBlock, yPos + y()); return right; } else { RenderBlock* cb = this; while (cb != rootBlock) { right += cb->x(); cb = cb->containingBlock(); } } return right; } void RenderBlock::insertPositionedObject(RenderBox* o) { // Create the list of special objects if we don't aleady have one if (!m_positionedObjects) m_positionedObjects = new ListHashSet; m_positionedObjects->add(o); } void RenderBlock::removePositionedObject(RenderBox* o) { if (m_positionedObjects) m_positionedObjects->remove(o); } void RenderBlock::removePositionedObjects(RenderBlock* o) { if (!m_positionedObjects) return; RenderBox* r; Iterator end = m_positionedObjects->end(); Vector deadObjects; for (Iterator it = m_positionedObjects->begin(); it != end; ++it) { r = *it; if (!o || r->isDescendantOf(o)) { if (o) r->setChildNeedsLayout(true, false); // It is parent blocks job to add positioned child to positioned objects list of its containing block // Parent layout needs to be invalidated to ensure this happens. RenderObject* p = r->parent(); while (p && !p->isRenderBlock()) p = p->parent(); if (p) p->setChildNeedsLayout(true); deadObjects.append(r); } } for (unsigned i = 0; i < deadObjects.size(); i++) m_positionedObjects->remove(deadObjects.at(i)); } void RenderBlock::insertFloatingObject(RenderBox* o) { ASSERT(o->isFloating()); // Create the list of special objects if we don't aleady have one if (!m_floatingObjects) { m_floatingObjects = new DeprecatedPtrList; m_floatingObjects->setAutoDelete(true); } else { // Don't insert the object again if it's already in the list DeprecatedPtrListIterator it(*m_floatingObjects); FloatingObject* f; while ( (f = it.current()) ) { if (f->m_renderer == o) return; ++it; } } // Create the special object entry & append it to the list o->layoutIfNeeded(); FloatingObject* newObj = new FloatingObject(o->style()->floating() == FLEFT ? FloatingObject::FloatLeft : FloatingObject::FloatRight); newObj->m_top = -1; newObj->m_bottom = -1; newObj->m_width = o->width() + o->marginLeft() + o->marginRight(); newObj->m_shouldPaint = !o->hasSelfPaintingLayer(); // If a layer exists, the float will paint itself. Otherwise someone else will. newObj->m_isDescendant = true; newObj->m_renderer = o; m_floatingObjects->append(newObj); } void RenderBlock::removeFloatingObject(RenderBox* o) { if (m_floatingObjects) { DeprecatedPtrListIterator it(*m_floatingObjects); while (it.current()) { if (it.current()->m_renderer == o) { if (childrenInline()) markLinesDirtyInVerticalRange(0, it.current()->m_bottom); m_floatingObjects->removeRef(it.current()); } ++it; } } } bool RenderBlock::positionNewFloats() { if (!m_floatingObjects) return false; FloatingObject* f = m_floatingObjects->last(); // If all floats have already been positioned, then we have no work to do. if (!f || f->m_top != -1) return false; // Move backwards through our floating object list until we find a float that has // already been positioned. Then we'll be able to move forward, positioning all of // the new floats that need it. FloatingObject* lastFloat = m_floatingObjects->getPrev(); while (lastFloat && lastFloat->m_top == -1) { f = m_floatingObjects->prev(); lastFloat = m_floatingObjects->getPrev(); } int y = height(); // The float cannot start above the y position of the last positioned float. if (lastFloat) y = max(lastFloat->m_top, y); // Now walk through the set of unpositioned floats and place them. while (f) { // The containing block is responsible for positioning floats, so if we have floats in our // list that come from somewhere else, do not attempt to position them. if (f->m_renderer->containingBlock() != this) { f = m_floatingObjects->next(); continue; } RenderBox* o = f->m_renderer; int _height = o->height() + o->marginTop() + o->marginBottom(); int ro = rightOffset(); // Constant part of right offset. int lo = leftOffset(); // Constat part of left offset. int fwidth = f->m_width; // The width we look for. if (ro - lo < fwidth) fwidth = ro - lo; // Never look for more than what will be available. IntRect oldRect(o->x(), o->y() , o->width(), o->height()); if (o->style()->clear() & CLEFT) y = max(leftBottom(), y); if (o->style()->clear() & CRIGHT) y = max(rightBottom(), y); if (o->style()->floating() == FLEFT) { int heightRemainingLeft = 1; int heightRemainingRight = 1; int fx = leftRelOffset(y, lo, false, &heightRemainingLeft); while (rightRelOffset(y, ro, false, &heightRemainingRight)-fx < fwidth) { y += min(heightRemainingLeft, heightRemainingRight); fx = leftRelOffset(y, lo, false, &heightRemainingLeft); } fx = max(0, fx); f->m_left = fx; o->setLocation(fx + o->marginLeft(), y + o->marginTop()); } else { int heightRemainingLeft = 1; int heightRemainingRight = 1; int fx = rightRelOffset(y, ro, false, &heightRemainingRight); while (fx - leftRelOffset(y, lo, false, &heightRemainingLeft) < fwidth) { y += min(heightRemainingLeft, heightRemainingRight); fx = rightRelOffset(y, ro, false, &heightRemainingRight); } f->m_left = fx - f->m_width; o->setLocation(fx - o->marginRight() - o->width(), y + o->marginTop()); } f->m_top = y; f->m_bottom = f->m_top + _height; // If the child moved, we have to repaint it. if (o->checkForRepaintDuringLayout()) o->repaintDuringLayoutIfMoved(oldRect); f = m_floatingObjects->next(); } return true; } void RenderBlock::newLine(EClear clear) { positionNewFloats(); // set y position int newY = 0; switch (clear) { case CLEFT: newY = leftBottom(); break; case CRIGHT: newY = rightBottom(); break; case CBOTH: newY = floatBottom(); default: break; } if (height() < newY) setHeight(newY); } void RenderBlock::addPercentHeightDescendant(RenderBox* descendant) { if (!gPercentHeightDescendantsMap) { gPercentHeightDescendantsMap = new PercentHeightDescendantsMap; gPercentHeightContainerMap = new PercentHeightContainerMap; } HashSet* descendantSet = gPercentHeightDescendantsMap->get(this); if (!descendantSet) { descendantSet = new HashSet; gPercentHeightDescendantsMap->set(this, descendantSet); } bool added = descendantSet->add(descendant).second; if (!added) { ASSERT(gPercentHeightContainerMap->get(descendant)); ASSERT(gPercentHeightContainerMap->get(descendant)->contains(this)); return; } HashSet* containerSet = gPercentHeightContainerMap->get(descendant); if (!containerSet) { containerSet = new HashSet; gPercentHeightContainerMap->set(descendant, containerSet); } ASSERT(!containerSet->contains(this)); containerSet->add(this); } void RenderBlock::removePercentHeightDescendant(RenderBox* descendant) { if (!gPercentHeightContainerMap) return; HashSet* containerSet = gPercentHeightContainerMap->take(descendant); if (!containerSet) return; HashSet::iterator end = containerSet->end(); for (HashSet::iterator it = containerSet->begin(); it != end; ++it) { RenderBlock* container = *it; HashSet* descendantSet = gPercentHeightDescendantsMap->get(container); ASSERT(descendantSet); if (!descendantSet) continue; ASSERT(descendantSet->contains(descendant)); descendantSet->remove(descendant); if (descendantSet->isEmpty()) { gPercentHeightDescendantsMap->remove(container); delete descendantSet; } } delete containerSet; } HashSet* RenderBlock::percentHeightDescendants() const { return gPercentHeightDescendantsMap ? gPercentHeightDescendantsMap->get(this) : 0; } int RenderBlock::leftOffset() const { return borderLeft() + paddingLeft(); } int RenderBlock::leftRelOffset(int y, int fixedOffset, bool applyTextIndent, int* heightRemaining) const { int left = fixedOffset; if (m_floatingObjects) { if ( heightRemaining ) *heightRemaining = 1; FloatingObject* r; DeprecatedPtrListIterator it(*m_floatingObjects); for ( ; (r = it.current()); ++it ) { if (r->m_top <= y && r->m_bottom > y && r->type() == FloatingObject::FloatLeft && r->m_left + r->m_width > left) { left = r->m_left + r->m_width; if ( heightRemaining ) *heightRemaining = r->m_bottom - y; } } } if (applyTextIndent && style()->direction() == LTR) { int cw = 0; if (style()->textIndent().isPercent()) cw = containingBlock()->availableWidth(); left += style()->textIndent().calcMinValue(cw); } return left; } int RenderBlock::rightOffset() const { return borderLeft() + paddingLeft() + availableWidth(); } int RenderBlock::rightRelOffset(int y, int fixedOffset, bool applyTextIndent, int* heightRemaining) const { int right = fixedOffset; if (m_floatingObjects) { if (heightRemaining) *heightRemaining = 1; FloatingObject* r; DeprecatedPtrListIterator it(*m_floatingObjects); for ( ; (r = it.current()); ++it ) { if (r->m_top <= y && r->m_bottom > y && r->type() == FloatingObject::FloatRight && r->m_left < right) { right = r->m_left; if ( heightRemaining ) *heightRemaining = r->m_bottom - y; } } } if (applyTextIndent && style()->direction() == RTL) { int cw = 0; if (style()->textIndent().isPercent()) cw = containingBlock()->availableWidth(); right -= style()->textIndent().calcMinValue(cw); } return right; } int RenderBlock::lineWidth(int y, bool firstLine) const { int result = rightOffset(y, firstLine) - leftOffset(y, firstLine); return (result < 0) ? 0 : result; } int RenderBlock::nextFloatBottomBelow(int height) const { if (!m_floatingObjects) return 0; int bottom = INT_MAX; FloatingObject* r; DeprecatedPtrListIterator it(*m_floatingObjects); for ( ; (r = it.current()); ++it) { if (r->m_bottom > height) bottom = min(r->m_bottom, bottom); } return bottom == INT_MAX ? 0 : bottom; } int RenderBlock::floatBottom() const { if (!m_floatingObjects) return 0; int bottom = 0; FloatingObject* r; DeprecatedPtrListIterator it(*m_floatingObjects); for ( ; (r = it.current()); ++it ) if (r->m_bottom>bottom) bottom = r->m_bottom; return bottom; } IntRect RenderBlock::floatRect() const { IntRect result; if (!m_floatingObjects || hasOverflowClip()) return result; FloatingObject* r; DeprecatedPtrListIterator it(*m_floatingObjects); for (; (r = it.current()); ++it) { if (r->m_shouldPaint && !r->m_renderer->hasSelfPaintingLayer()) { IntRect childRect = r->m_renderer->overflowRect(false); childRect.move(r->m_left + r->m_renderer->marginLeft(), r->m_top + r->m_renderer->marginTop()); result.unite(childRect); } } return result; } int RenderBlock::lowestPosition(bool includeOverflowInterior, bool includeSelf) const { if (!includeOverflowInterior && (hasOverflowClip() || hasControlClip())) return includeSelf && width() > 0 ? overflowHeight(false) : 0; int bottom = includeSelf && width() > 0 ? height() : 0; if (!hasColumns()) { // FIXME: Come up with a way to use the layer tree to avoid visiting all the kids. // For now, we have to descend into all the children, since we may have a huge abs div inside // a tiny rel div buried somewhere deep in our child tree. In this case we have to get to // the abs div. // See the last test case in https://bugs.webkit.org/show_bug.cgi?id=9314 for why this is a problem. // For inline children, we miss relative positioned boxes that might be buried inside s. for (RenderObject* c = firstChild(); c; c = c->nextSibling()) { if (!c->isFloatingOrPositioned() && c->isBox()) { RenderBox* childBox = toRenderBox(c); bottom = max(bottom, childBox->y() + childBox->lowestPosition(false)); } } } if (includeSelf && isRelPositioned()) bottom += relativePositionOffsetY(); if (!includeOverflowInterior && hasOverflowClip()) return bottom; int relativeOffset = includeSelf && isRelPositioned() ? relativePositionOffsetY() : 0; if (includeSelf) bottom = max(bottom, m_overflowHeight + relativeOffset); if (m_positionedObjects) { RenderBox* r; Iterator end = m_positionedObjects->end(); for (Iterator it = m_positionedObjects->begin(); it != end; ++it) { r = *it; // Fixed positioned objects do not scroll and thus should not constitute // part of the lowest position. if (r->style()->position() != FixedPosition) { // FIXME: Should work for overflow sections too. // If a positioned object lies completely to the left of the root it will be unreachable via scrolling. // Therefore we should not allow it to contribute to the lowest position. if (!isRenderView() || r->x() + r->width() > 0 || r->x() + r->rightmostPosition(false) > 0) { int lp = r->y() + r->lowestPosition(false); bottom = max(bottom, lp + relativeOffset); } } } } if (hasColumns()) { Vector* colRects = columnRects(); for (unsigned i = 0; i < colRects->size(); i++) bottom = max(bottom, colRects->at(i).bottom() + relativeOffset); return bottom; } if (m_floatingObjects) { FloatingObject* r; DeprecatedPtrListIterator it(*m_floatingObjects); for ( ; (r = it.current()); ++it ) { if (r->m_shouldPaint || r->m_renderer->hasSelfPaintingLayer()) { int lp = r->m_top + r->m_renderer->marginTop() + r->m_renderer->lowestPosition(false); bottom = max(bottom, lp + relativeOffset); } } } if (!includeSelf) { bottom = max(bottom, borderTop() + paddingTop() + paddingBottom() + relativeOffset); if (childrenInline()) { if (lastLineBox()) { int childBottomEdge = lastLineBox()->y() + lastLineBox()->height(); bottom = max(bottom, childBottomEdge + paddingBottom() + relativeOffset); } } else { // Find the last normal flow child. RenderBox* currBox = lastChildBox(); while (currBox && currBox->isFloatingOrPositioned()) currBox = currBox->previousSiblingBox(); if (currBox) { int childBottomEdge = currBox->y() + currBox->height() + currBox->collapsedMarginBottom(); bottom = max(bottom, childBottomEdge + paddingBottom() + relativeOffset); } } } return bottom; } int RenderBlock::rightmostPosition(bool includeOverflowInterior, bool includeSelf) const { if (!includeOverflowInterior && (hasOverflowClip() || hasControlClip())) return includeSelf && height() > 0 ? overflowWidth(false) : 0; int right = includeSelf && height() > 0 ? width() : 0; if (!hasColumns()) { // FIXME: Come up with a way to use the layer tree to avoid visiting all the kids. // For now, we have to descend into all the children, since we may have a huge abs div inside // a tiny rel div buried somewhere deep in our child tree. In this case we have to get to // the abs div. for (RenderObject* c = firstChild(); c; c = c->nextSibling()) { if (!c->isFloatingOrPositioned() && c->isBox()) { RenderBox* childBox = toRenderBox(c); right = max(right, childBox->x() + childBox->rightmostPosition(false)); } } } if (includeSelf && isRelPositioned()) right += relativePositionOffsetX(); if (!includeOverflowInterior && hasOverflowClip()) return right; int relativeOffset = includeSelf && isRelPositioned() ? relativePositionOffsetX() : 0; if (includeSelf) right = max(right, m_overflowWidth + relativeOffset); if (m_positionedObjects) { RenderBox* r; Iterator end = m_positionedObjects->end(); for (Iterator it = m_positionedObjects->begin() ; it != end; ++it) { r = *it; // Fixed positioned objects do not scroll and thus should not constitute // part of the rightmost position. if (r->style()->position() != FixedPosition) { // FIXME: Should work for overflow sections too. // If a positioned object lies completely above the root it will be unreachable via scrolling. // Therefore we should not allow it to contribute to the rightmost position. if (!isRenderView() || r->y() + r->height() > 0 || r->y() + r->lowestPosition(false) > 0) { int rp = r->x() + r->rightmostPosition(false); right = max(right, rp + relativeOffset); } } } } if (hasColumns()) { // This only matters for LTR if (style()->direction() == LTR) right = max(columnRects()->last().right() + relativeOffset, right); return right; } if (m_floatingObjects) { FloatingObject* r; DeprecatedPtrListIterator it(*m_floatingObjects); for ( ; (r = it.current()); ++it ) { if (r->m_shouldPaint || r->m_renderer->hasSelfPaintingLayer()) { int rp = r->m_left + r->m_renderer->marginLeft() + r->m_renderer->rightmostPosition(false); right = max(right, rp + relativeOffset); } } } if (!includeSelf) { right = max(right, borderLeft() + paddingLeft() + paddingRight() + relativeOffset); if (childrenInline()) { for (InlineRunBox* currBox = firstLineBox(); currBox; currBox = currBox->nextLineBox()) { int childRightEdge = currBox->x() + currBox->width(); // If this node is a root editable element, then the rightmostPosition should account for a caret at the end. // FIXME: Need to find another way to do this, since scrollbars could show when we don't want them to. if (node() && node()->isContentEditable() && node() == node()->rootEditableElement() && style()->direction() == LTR && !paddingRight()) childRightEdge += 1; right = max(right, childRightEdge + paddingRight() + relativeOffset); } } else { // Walk all normal flow children. for (RenderBox* currBox = firstChildBox(); currBox; currBox = currBox->nextSiblingBox()) { if (currBox->isFloatingOrPositioned()) continue; int childRightEdge = currBox->x() + currBox->width() + currBox->marginRight(); right = max(right, childRightEdge + paddingRight() + relativeOffset); } } } return right; } int RenderBlock::leftmostPosition(bool includeOverflowInterior, bool includeSelf) const { if (!includeOverflowInterior && (hasOverflowClip() || hasControlClip())) return includeSelf && height() > 0 ? overflowLeft(false) : width(); int left = includeSelf && height() > 0 ? 0 : width(); if (!hasColumns()) { // FIXME: Come up with a way to use the layer tree to avoid visiting all the kids. // For now, we have to descend into all the children, since we may have a huge abs div inside // a tiny rel div buried somewhere deep in our child tree. In this case we have to get to // the abs div. for (RenderObject* c = firstChild(); c; c = c->nextSibling()) { if (!c->isFloatingOrPositioned() && c->isBox()) { RenderBox* childBox = toRenderBox(c); left = min(left, childBox->x() + childBox->leftmostPosition(false)); } } } if (includeSelf && isRelPositioned()) left += relativePositionOffsetX(); if (!includeOverflowInterior && hasOverflowClip()) return left; int relativeOffset = includeSelf && isRelPositioned() ? relativePositionOffsetX() : 0; if (includeSelf) left = min(left, m_overflowLeft + relativeOffset); if (m_positionedObjects) { RenderBox* r; Iterator end = m_positionedObjects->end(); for (Iterator it = m_positionedObjects->begin(); it != end; ++it) { r = *it; // Fixed positioned objects do not scroll and thus should not constitute // part of the leftmost position. if (r->style()->position() != FixedPosition) { // FIXME: Should work for overflow sections too. // If a positioned object lies completely above the root it will be unreachable via scrolling. // Therefore we should not allow it to contribute to the leftmost position. if (!isRenderView() || r->y() + r->height() > 0 || r->y() + r->lowestPosition(false) > 0) { int lp = r->x() + r->leftmostPosition(false); left = min(left, lp + relativeOffset); } } } } if (hasColumns()) { // This only matters for RTL if (style()->direction() == RTL) left = min(columnRects()->last().x() + relativeOffset, left); return left; } if (m_floatingObjects) { FloatingObject* r; DeprecatedPtrListIterator it(*m_floatingObjects); for ( ; (r = it.current()); ++it ) { if (r->m_shouldPaint || r->m_renderer->hasSelfPaintingLayer()) { int lp = r->m_left + r->m_renderer->marginLeft() + r->m_renderer->leftmostPosition(false); left = min(left, lp + relativeOffset); } } } if (!includeSelf && firstLineBox()) { for (InlineRunBox* currBox = firstLineBox(); currBox; currBox = currBox->nextLineBox()) left = min(left, (int)currBox->x() + relativeOffset); } return left; } int RenderBlock::leftBottom() { if (!m_floatingObjects) return 0; int bottom = 0; FloatingObject* r; DeprecatedPtrListIterator it(*m_floatingObjects); for ( ; (r = it.current()); ++it ) if (r->m_bottom > bottom && r->type() == FloatingObject::FloatLeft) bottom = r->m_bottom; return bottom; } int RenderBlock::rightBottom() { if (!m_floatingObjects) return 0; int bottom = 0; FloatingObject* r; DeprecatedPtrListIterator it(*m_floatingObjects); for ( ; (r = it.current()); ++it ) if (r->m_bottom>bottom && r->type() == FloatingObject::FloatRight) bottom = r->m_bottom; return bottom; } void RenderBlock::markLinesDirtyInVerticalRange(int top, int bottom) { if (top >= bottom) return; RootInlineBox* lowestDirtyLine = lastRootBox(); RootInlineBox* afterLowest = lowestDirtyLine; while (lowestDirtyLine && lowestDirtyLine->blockHeight() >= bottom) { afterLowest = lowestDirtyLine; lowestDirtyLine = lowestDirtyLine->prevRootBox(); } while (afterLowest && afterLowest->blockHeight() >= top) { afterLowest->markDirty(); afterLowest = afterLowest->prevRootBox(); } } void RenderBlock::clearFloats() { // Inline blocks are covered by the isReplaced() check in the avoidFloats method. if (avoidsFloats() || isRoot() || isRenderView() || isFloatingOrPositioned() || isTableCell()) { if (m_floatingObjects) m_floatingObjects->clear(); return; } typedef HashMap RendererToFloatInfoMap; RendererToFloatInfoMap floatMap; if (m_floatingObjects) { if (childrenInline()) { m_floatingObjects->first(); while (FloatingObject* f = m_floatingObjects->take()) floatMap.add(f->m_renderer, f); } else m_floatingObjects->clear(); } // Attempt to locate a previous sibling with overhanging floats. We skip any elements that are // out of flow (like floating/positioned elements), and we also skip over any objects that may have shifted // to avoid floats. bool parentHasFloats = false; RenderObject* prev = previousSibling(); while (prev && (prev->isFloatingOrPositioned() || !prev->isBox() || !prev->isRenderBlock() || toRenderBlock(prev)->avoidsFloats())) { if (prev->isFloating()) parentHasFloats = true; prev = prev->previousSibling(); } // First add in floats from the parent. int offset = y(); if (parentHasFloats) { RenderBlock* parentBlock = toRenderBlock(parent()); addIntrudingFloats(parentBlock, parentBlock->borderLeft() + parentBlock->paddingLeft(), offset); } int xoffset = 0; if (prev) offset -= toRenderBox(prev)->y(); else if (parent()->isBox()) { prev = parent(); xoffset += toRenderBox(prev)->borderLeft() + toRenderBox(prev)->paddingLeft(); } // Add overhanging floats from the previous RenderBlock, but only if it has a float that intrudes into our space. if (!prev || !prev->isRenderBlock()) return; RenderBlock* block = toRenderBlock(prev); if (block->m_floatingObjects && block->floatBottom() > offset) addIntrudingFloats(block, xoffset, offset); if (childrenInline()) { int changeTop = INT_MAX; int changeBottom = INT_MIN; if (m_floatingObjects) { for (FloatingObject* f = m_floatingObjects->first(); f; f = m_floatingObjects->next()) { FloatingObject* oldFloatingObject = floatMap.get(f->m_renderer); if (oldFloatingObject) { if (f->m_width != oldFloatingObject->m_width || f->m_left != oldFloatingObject->m_left) { changeTop = 0; changeBottom = max(changeBottom, max(f->m_bottom, oldFloatingObject->m_bottom)); } else if (f->m_bottom != oldFloatingObject->m_bottom) { changeTop = min(changeTop, min(f->m_bottom, oldFloatingObject->m_bottom)); changeBottom = max(changeBottom, max(f->m_bottom, oldFloatingObject->m_bottom)); } floatMap.remove(f->m_renderer); delete oldFloatingObject; } else { changeTop = 0; changeBottom = max(changeBottom, f->m_bottom); } } } RendererToFloatInfoMap::iterator end = floatMap.end(); for (RendererToFloatInfoMap::iterator it = floatMap.begin(); it != end; ++it) { FloatingObject* floatingObject = (*it).second; if (!floatingObject->m_isDescendant) { changeTop = 0; changeBottom = max(changeBottom, floatingObject->m_bottom); } } deleteAllValues(floatMap); markLinesDirtyInVerticalRange(changeTop, changeBottom); } } int RenderBlock::addOverhangingFloats(RenderBlock* child, int xoff, int yoff, bool makeChildPaintOtherFloats) { // Prevent floats from being added to the canvas by the root element, e.g., . if (child->hasOverflowClip() || !child->containsFloats() || child->isRoot()) return 0; int lowestFloatBottom = 0; // Floats that will remain the child's responsiblity to paint should factor into its // visual overflow. IntRect floatsOverflowRect; DeprecatedPtrListIterator it(*child->m_floatingObjects); for (FloatingObject* r; (r = it.current()); ++it) { int bottom = child->y() + r->m_bottom; lowestFloatBottom = max(lowestFloatBottom, bottom); if (bottom > height()) { // If the object is not in the list, we add it now. if (!containsFloat(r->m_renderer)) { FloatingObject *floatingObj = new FloatingObject(r->type()); floatingObj->m_top = r->m_top - yoff; floatingObj->m_bottom = r->m_bottom - yoff; floatingObj->m_left = r->m_left - xoff; floatingObj->m_width = r->m_width; floatingObj->m_renderer = r->m_renderer; // The nearest enclosing layer always paints the float (so that zindex and stacking // behaves properly). We always want to propagate the desire to paint the float as // far out as we can, to the outermost block that overlaps the float, stopping only // if we hit a self-painting layer boundary. if (r->m_renderer->enclosingSelfPaintingLayer() == enclosingSelfPaintingLayer()) r->m_shouldPaint = false; else floatingObj->m_shouldPaint = false; // We create the floating object list lazily. if (!m_floatingObjects) { m_floatingObjects = new DeprecatedPtrList; m_floatingObjects->setAutoDelete(true); } m_floatingObjects->append(floatingObj); } } else if (makeChildPaintOtherFloats && !r->m_shouldPaint && !r->m_renderer->hasSelfPaintingLayer() && r->m_renderer->isDescendantOf(child) && r->m_renderer->enclosingLayer() == child->enclosingLayer()) // The float is not overhanging from this block, so if it is a descendant of the child, the child should // paint it (the other case is that it is intruding into the child), unless it has its own layer or enclosing // layer. // If makeChildPaintOtherFloats is false, it means that the child must already know about all the floats // it should paint. r->m_shouldPaint = true; if (r->m_shouldPaint && !r->m_renderer->hasSelfPaintingLayer()) { IntRect floatOverflowRect = r->m_renderer->overflowRect(false); floatOverflowRect.move(r->m_left + r->m_renderer->marginLeft(), r->m_top + r->m_renderer->marginTop()); floatsOverflowRect.unite(floatOverflowRect); } } child->addVisualOverflow(floatsOverflowRect); return lowestFloatBottom; } void RenderBlock::addIntrudingFloats(RenderBlock* prev, int xoff, int yoff) { // If the parent or previous sibling doesn't have any floats to add, don't bother. if (!prev->m_floatingObjects) return; DeprecatedPtrListIterator it(*prev->m_floatingObjects); for (FloatingObject *r; (r = it.current()); ++it) { if (r->m_bottom > yoff) { // The object may already be in our list. Check for it up front to avoid // creating duplicate entries. FloatingObject* f = 0; if (m_floatingObjects) { DeprecatedPtrListIterator it(*m_floatingObjects); while ((f = it.current())) { if (f->m_renderer == r->m_renderer) break; ++it; } } if (!f) { FloatingObject *floatingObj = new FloatingObject(r->type()); floatingObj->m_top = r->m_top - yoff; floatingObj->m_bottom = r->m_bottom - yoff; floatingObj->m_left = r->m_left - xoff; // Applying the child's margin makes no sense in the case where the child was passed in. // since his own margin was added already through the subtraction of the |xoff| variable // above. |xoff| will equal -flow->marginLeft() in this case, so it's already been taken // into account. Only apply this code if |child| is false, since otherwise the left margin // will get applied twice. if (prev != parent()) floatingObj->m_left += prev->marginLeft(); floatingObj->m_left -= marginLeft(); floatingObj->m_shouldPaint = false; // We are not in the direct inheritance chain for this float. We will never paint it. floatingObj->m_width = r->m_width; floatingObj->m_renderer = r->m_renderer; // We create the floating object list lazily. if (!m_floatingObjects) { m_floatingObjects = new DeprecatedPtrList; m_floatingObjects->setAutoDelete(true); } m_floatingObjects->append(floatingObj); } } } } bool RenderBlock::avoidsFloats() const { // Floats can't intrude into our box if we have a non-auto column count or width. return RenderBox::avoidsFloats() || !style()->hasAutoColumnCount() || !style()->hasAutoColumnWidth(); } bool RenderBlock::containsFloat(RenderObject* o) { if (m_floatingObjects) { DeprecatedPtrListIterator it(*m_floatingObjects); while (it.current()) { if (it.current()->m_renderer == o) return true; ++it; } } return false; } void RenderBlock::markAllDescendantsWithFloatsForLayout(RenderBox* floatToRemove, bool inLayout) { setChildNeedsLayout(true, !inLayout); if (floatToRemove) removeFloatingObject(floatToRemove); // Iterate over our children and mark them as needed. if (!childrenInline()) { for (RenderObject* child = firstChild(); child; child = child->nextSibling()) { if ((!floatToRemove && child->isFloatingOrPositioned()) || !child->isRenderBlock()) continue; RenderBlock* childBlock = toRenderBlock(child); if ((floatToRemove ? childBlock->containsFloat(floatToRemove) : childBlock->containsFloats()) || childBlock->shrinkToAvoidFloats()) childBlock->markAllDescendantsWithFloatsForLayout(floatToRemove, inLayout); } } } int RenderBlock::getClearDelta(RenderBox* child, int yPos) { // There is no need to compute clearance if we have no floats. if (!containsFloats()) return 0; // At least one float is present. We need to perform the clearance computation. bool clearSet = child->style()->clear() != CNONE; int bottom = 0; switch (child->style()->clear()) { case CNONE: break; case CLEFT: bottom = leftBottom(); break; case CRIGHT: bottom = rightBottom(); break; case CBOTH: bottom = floatBottom(); break; } // We also clear floats if we are too big to sit on the same line as a float (and wish to avoid floats by default). // FIXME: Note that the remaining space checks aren't quite accurate, since you should be able to clear only some floats (the minimum # needed // to fit) and not all (we should be using nextFloatBottomBelow and looping). // Do not allow tables to wrap in quirks or even in almost strict mode // (ebay on the PLT, finance.yahoo.com in the real world, versiontracker.com forces even almost strict mode not to work) int result = clearSet ? max(0, bottom - yPos) : 0; if (!result && child->avoidsFloats() && child->style()->width().isFixed() && child->minPrefWidth() > lineWidth(yPos, false) && child->minPrefWidth() <= availableWidth() && document()->inStrictMode()) result = max(0, floatBottom() - yPos); return result; } void RenderBlock::addVisualOverflow(const IntRect& r) { if (r.isEmpty()) return; m_overflowLeft = min(m_overflowLeft, r.x()); m_overflowWidth = max(m_overflowWidth, r.right()); m_overflowTop = min(m_overflowTop, r.y()); m_overflowHeight = max(m_overflowHeight, r.bottom()); } bool RenderBlock::isPointInOverflowControl(HitTestResult& result, int _x, int _y, int _tx, int _ty) { if (!scrollsOverflow()) return false; return layer()->hitTestOverflowControls(result, IntPoint(_x - _tx, _y - _ty)); } bool RenderBlock::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int _x, int _y, int _tx, int _ty, HitTestAction hitTestAction) { int tx = _tx + x(); int ty = _ty + y(); if (!isRenderView()) { // Check if we need to do anything at all. IntRect overflowBox = overflowRect(false); overflowBox.move(tx, ty); if (!overflowBox.contains(_x, _y)) return false; } if ((hitTestAction == HitTestBlockBackground || hitTestAction == HitTestChildBlockBackground) && isPointInOverflowControl(result, _x, _y, tx, ty)) { updateHitTestResult(result, IntPoint(_x - tx, _y - ty)); return true; } // If we have clipping, then we can't have any spillout. bool useOverflowClip = hasOverflowClip() && !hasSelfPaintingLayer(); bool useClip = (hasControlClip() || useOverflowClip); bool checkChildren = !useClip || (hasControlClip() ? controlClipRect(tx, ty).contains(_x, _y) : overflowClipRect(tx, ty).contains(_x, _y)); if (checkChildren) { // Hit test descendants first. int scrolledX = tx; int scrolledY = ty; if (hasOverflowClip()) layer()->subtractScrolledContentOffset(scrolledX, scrolledY); // Hit test contents if we don't have columns. if (!hasColumns() && hitTestContents(request, result, _x, _y, scrolledX, scrolledY, hitTestAction)) return true; // Hit test our columns if we do have them. if (hasColumns() && hitTestColumns(request, result, _x, _y, scrolledX, scrolledY, hitTestAction)) return true; // Hit test floats. if (hitTestAction == HitTestFloat && m_floatingObjects) { if (isRenderView()) { scrolledX += toRenderView(this)->frameView()->scrollX(); scrolledY += toRenderView(this)->frameView()->scrollY(); } FloatingObject* o; DeprecatedPtrListIterator it(*m_floatingObjects); for (it.toLast(); (o = it.current()); --it) { if (o->m_shouldPaint && !o->m_renderer->hasSelfPaintingLayer()) { int xoffset = scrolledX + o->m_left + o->m_renderer->marginLeft() - o->m_renderer->x(); int yoffset = scrolledY + o->m_top + o->m_renderer->marginTop() - o->m_renderer->y(); if (o->m_renderer->hitTest(request, result, IntPoint(_x, _y), xoffset, yoffset)) { updateHitTestResult(result, IntPoint(_x - xoffset, _y - yoffset)); return true; } } } } } // Now hit test our background if (hitTestAction == HitTestBlockBackground || hitTestAction == HitTestChildBlockBackground) { IntRect boundsRect(tx, ty, width(), height()); if (visibleToHitTesting() && boundsRect.contains(_x, _y)) { updateHitTestResult(result, IntPoint(_x - tx, _y - ty)); return true; } } return false; } bool RenderBlock::hitTestColumns(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction) { // We need to do multiple passes, breaking up our hit testing into strips. // We can always go left to right, since column contents are clipped (meaning that there // can't be any overlap). int currXOffset = 0; int currYOffset = 0; int colGap = columnGap(); Vector* colRects = columnRects(); for (unsigned i = 0; i < colRects->size(); i++) { IntRect colRect = colRects->at(i); colRect.move(tx, ty); if (colRect.contains(x, y)) { // The point is inside this column. // Adjust tx and ty to change where we hit test. int finalX = tx + currXOffset; int finalY = ty + currYOffset; return hitTestContents(request, result, x, y, finalX, finalY, hitTestAction); } // Move to the next position. if (style()->direction() == LTR) currXOffset += colRect.width() + colGap; else currXOffset -= (colRect.width() + colGap); currYOffset -= colRect.height(); } return false; } bool RenderBlock::hitTestContents(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction) { if (childrenInline() && !isTable()) { // We have to hit-test our line boxes. if (m_lineBoxes.hitTest(this, request, result, x, y, tx, ty, hitTestAction)) { updateHitTestResult(result, IntPoint(x - tx, y - ty)); return true; } } else { // Hit test our children. HitTestAction childHitTest = hitTestAction; if (hitTestAction == HitTestChildBlockBackgrounds) childHitTest = HitTestChildBlockBackground; for (RenderBox* child = lastChildBox(); child; child = child->previousSiblingBox()) { if (!child->hasSelfPaintingLayer() && !child->isFloating() && child->nodeAtPoint(request, result, x, y, tx, ty, childHitTest)) { updateHitTestResult(result, IntPoint(x - tx, y - ty)); return true; } } } return false; } Position RenderBlock::positionForBox(InlineBox *box, bool start) const { if (!box) return Position(); if (!box->renderer()->node()) return Position(node(), start ? caretMinOffset() : caretMaxOffset()); if (!box->isInlineTextBox()) return Position(box->renderer()->node(), start ? box->renderer()->caretMinOffset() : box->renderer()->caretMaxOffset()); InlineTextBox *textBox = static_cast(box); return Position(box->renderer()->node(), start ? textBox->start() : textBox->start() + textBox->len()); } Position RenderBlock::positionForRenderer(RenderObject* renderer, bool start) const { if (!renderer) return Position(node(), 0); Node* n = renderer->node() ? renderer->node() : node(); if (!n) return Position(); ASSERT(renderer == n->renderer()); int offset = start ? renderer->caretMinOffset() : renderer->caretMaxOffset(); // FIXME: This was a runtime check that seemingly couldn't fail; changed it to an assertion for now. ASSERT(!n->isCharacterDataNode() || renderer->isText()); return Position(n, offset); } // FIXME: This function should go on RenderObject as an instance method. Then // all cases in which positionForPoint recurs could call this instead to // prevent crossing editable boundaries. This would require many tests. static VisiblePosition positionForPointRespectingEditingBoundaries(RenderBox* parent, RenderBox* child, const IntPoint& pointInParentCoordinates) { IntPoint pointInChildCoordinates(pointInParentCoordinates - child->location()); // If this is an anonymous renderer, we just recur normally Node* childNode = child->node(); if (!childNode) return child->positionForPoint(pointInChildCoordinates); // Otherwise, first make sure that the editability of the parent and child agree. // If they don't agree, then we return a visible position just before or after the child RenderObject* ancestor = parent; while (ancestor && !ancestor->node()) ancestor = ancestor->parent(); // If we can't find an ancestor to check editability on, or editability is unchanged, we recur like normal if (!ancestor || ancestor->node()->isContentEditable() == childNode->isContentEditable()) return child->positionForPoint(pointInChildCoordinates); // Otherwise return before or after the child, depending on if the click was left or right of the child int childMidX = child->width() / 2; if (pointInChildCoordinates.x() < childMidX) return ancestor->createVisiblePosition(childNode->nodeIndex(), DOWNSTREAM); return ancestor->createVisiblePosition(childNode->nodeIndex() + 1, UPSTREAM); } VisiblePosition RenderBlock::positionForPointWithInlineChildren(const IntPoint& pointInContents) { ASSERT(childrenInline()); if (!firstRootBox()) return createVisiblePosition(0, DOWNSTREAM); // look for the closest line box in the root box which is at the passed-in y coordinate InlineBox* closestBox = 0; RootInlineBox* firstRootBoxWithChildren = 0; RootInlineBox* lastRootBoxWithChildren = 0; for (RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox()) { if (!root->firstChild()) continue; if (!firstRootBoxWithChildren) firstRootBoxWithChildren = root; lastRootBoxWithChildren = root; // set the bottom based on whether there is a next root box // FIXME: This will consider nextRootBox even if it has no children, and maybe it shouldn't. int bottom; if (root->nextRootBox()) { // FIXME: We would prefer to make the break point halfway between the bottom // of the previous root box and the top of the next root box. bottom = root->nextRootBox()->topOverflow(); } else bottom = root->bottomOverflow() + verticalLineClickFudgeFactor; // check if this root line box is located at this y coordinate if (pointInContents.y() < bottom) { closestBox = root->closestLeafChildForXPos(pointInContents.x()); if (closestBox) break; } } Settings* settings = document()->settings(); bool useWindowsBehavior = settings && settings->editingBehavior() == EditingWindowsBehavior; if (useWindowsBehavior && !closestBox && lastRootBoxWithChildren) { // y coordinate is below last root line box, pretend we hit it closestBox = lastRootBoxWithChildren->closestLeafChildForXPos(pointInContents.x()); } if (closestBox) { if (!useWindowsBehavior && pointInContents.y() < firstRootBoxWithChildren->topOverflow() - verticalLineClickFudgeFactor) { // y coordinate is above first root line box, so return the start of the first return VisiblePosition(positionForBox(firstRootBoxWithChildren->firstLeafChild(), true), DOWNSTREAM); } // pass the box a y position that is inside it return closestBox->renderer()->positionForPoint(IntPoint(pointInContents.x(), closestBox->m_y)); } if (lastRootBoxWithChildren) { // We hit this case for Mac behavior when the Y coordinate is below the last box. ASSERT(!useWindowsBehavior); return VisiblePosition(positionForBox(lastRootBoxWithChildren->lastLeafChild(), false), DOWNSTREAM); } // Can't reach this. We have a root line box, but it has no kids. // FIXME: This should ASSERT_NOT_REACHED(), but clicking on placeholder text // seems to hit this code path. return createVisiblePosition(0, DOWNSTREAM); } static inline bool isChildHitTestCandidate(RenderBox* box) { return box->height() && box->style()->visibility() == VISIBLE && !box->isFloatingOrPositioned(); } VisiblePosition RenderBlock::positionForPoint(const IntPoint& point) { if (isTable()) return RenderBox::positionForPoint(point); if (isReplaced()) { if (point.y() < 0 || (point.y() < height() && point.x() < 0)) return createVisiblePosition(caretMinOffset(), DOWNSTREAM); if (point.y() >= height() || (point.y() >= 0 && point.x() >= width())) return createVisiblePosition(caretMaxOffset(), DOWNSTREAM); } int contentsX = point.x(); int contentsY = point.y(); offsetForContents(contentsX, contentsY); IntPoint pointInContents(contentsX, contentsY); if (childrenInline()) return positionForPointWithInlineChildren(pointInContents); if (lastChildBox() && contentsY > lastChildBox()->y()) { for (RenderBox* childBox = lastChildBox(); childBox; childBox = childBox->previousSiblingBox()) { if (isChildHitTestCandidate(childBox)) return positionForPointRespectingEditingBoundaries(this, childBox, pointInContents); } } else { for (RenderBox* childBox = firstChildBox(); childBox; childBox = childBox->nextSiblingBox()) { // We hit child if our click is above the bottom of its padding box (like IE6/7 and FF3). if (isChildHitTestCandidate(childBox) && contentsY < childBox->frameRect().bottom()) return positionForPointRespectingEditingBoundaries(this, childBox, pointInContents); } } // We only get here if there are no hit test candidate children below the click. return RenderBox::positionForPoint(point); } void RenderBlock::offsetForContents(int& tx, int& ty) const { if (hasOverflowClip()) layer()->addScrolledContentOffset(tx, ty); if (hasColumns()) { IntPoint contentsPoint(tx, ty); adjustPointToColumnContents(contentsPoint); tx = contentsPoint.x(); ty = contentsPoint.y(); } } int RenderBlock::availableWidth() const { // If we have multiple columns, then the available width is reduced to our column width. if (hasColumns()) return desiredColumnWidth(); return contentWidth(); } int RenderBlock::columnGap() const { if (style()->hasNormalColumnGap()) return style()->fontDescription().computedPixelSize(); // "1em" is recommended as the normal gap setting. 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